Re: PA28-181 Fuel pressure drop off - Inspired by the Gascolotor thread.

Roy Page wrote:

On the flight home, we noticed on long climbs that the fuel pressure fell off from an indicated mid scale reading to about one third scale. 

<snip>

A few months passed and then occasionally I noticed a slight fall off in fuel pressure when climbing.
I concluded that the mechanical engine driven fuel pump must be getting tired and, to be safe, replaced it with a new pump three weeks ago.
No change, the fuel pressure still falls off when climbing and returns to mid scale in level cruise. 

<snip>

Our PA28-180 has a similar fall off in fuel pressure when climbing.

I don't know what causes it, but the PA28-180 I previously owned did this, too. First time I saw it, I made a precautionary landing, no trouble found. Like you, I went over everything and never found any fault. Eventually I concluded it was just a peculiarity of the model and was benign. If you find a way to fix it, let us all know.

Dave
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